Channel Master CM-6001 Specifications download pdf (Page 88)

Channel Master Operation Manual

page 82 RD Instruments

Header information is the first item sent by the Channel Master to the out-

put buffer. The Channel Master always sends the Least Significant Byte

(LSB) first.

Table 17: Header Data Format

Hex Digit Binary

Byte

Field Description

1,2 1 HDR ID /

Header ID

Stores the header identification byte (7Fh).

3,4 2 HDR ID / Data

Source ID

Stores the data source identification byte (7Fh for the Channel

Master).

5-8 3,4 Bytes / Num-

ber of bytes in

ensemble

This field contains the number of bytes from the start of the

current ensemble up to, but not including, the 2-byte checksum

(Figure 37, page 105).

9,10 5 Spare Undefined.

11,12 6 No. DT / Num-

ber of Data

Types

This field contains the number of data types selected for collec-

tion. By default, fixed/variable leader, velocity, correlation

magnitude, echo intensity, and percent good are selected for

collection. This field will therefore have a value of six (4 data

types + 2 for the Fixed/Variable Leader data).

13-16 7,8 Address Offset

for Data Type

#1 / Offset for

Data Type #1

This field contains the internal memory address offset where

the Channel Master will store information for data type #1 (with

this firmware, always the Fixed Leader). Adding “1” to this

offset number gives the absolute Binary Byte number in the

ensemble where Data Type #1 begins (the first byte of the

ensemble is Binary Byte #1).

17-20 9,10 Address Offset

for Data Type

#2 / Offset for

Data Type #2

This field contains the internal memory address offset where

the Channel Master will store information for data type #2 (with

this firmware, always the Variable Leader). Adding “1” to this

offset number gives the absolute Binary Byte number in the

ensemble where Data Type #2 begins (the first byte of the

ensemble is Binary Byte #1).

21-24

thru

2n+13 to

2n+16

11,12

thru

2n+5,

2n+6

Address Off-

sets for Data

Types #3-n /

Offset for Data

Type #3

through #n

These fields contain internal memory address offset where the

Channel Master will store information for data type #3 through

data type #n. Adding “1” to this offset number gives the abso-

lute Binary Byte number in the ensemble where Data Types #3-

n begin (first byte of ensemble is Binary Byte) #1).

1 2 ... 83 84 85 86 87 88 89 90 91 92 93 ... 137 138

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Channel Master CM-6001 Specifications Page 88

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